<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Side Panel Demo</title>
  </head>
  <body>
    <h1>demo</h1>
    <div>
      selection <input id="SelectionContent" />
     左侧<input id="urlContent"/>
    </div>
    <p>Click on the button below to open the side panel</p>
    <button id="openSidePanel">Open side panel</button>
    <script src="script.js" type="module"></script>
  </body>
</html>
